She's shy and doesn't want to flat out tell you she likes you. Girls like that fairy tale business where nobody says anything, they just fall in love. She's just trying to give it a nudge...
"So tonight, when you're wondering what to say, or how you look, or whether or not she likes you, just remember, she is already out with you. That means she said yes when she could have said no. That means she made a plan when she could have just blown you off. So that means it is no longer your job to try to make her like you. It is your job not to mess it up."
-Hitch